New Jersey Gov. Chris Christie, a former chairman of President Donald Trump’s transition team, said Monday that he repeatedly recommended that Trump not give a job to Lt. Gen. Michael Flynn, the former national security adviser now under investigation for potential collusion with Russia during the campaign.

‘‘If I were president-elect of the United States, I wouldn’t let General Flynn in the White House, let alone give him a job,’’ Christie said during a during a wide-ranging news conference in Trenton, N.J.

Christie, a Republican who was relieved of his duties overseeing the transition shortly after the November election, declined to detail his concerns about Flynn.

‘‘I’m not going to get into specifics,’’ Christie said. ‘‘Some of it involves classified information that I’m just not at liberty to discuss.’’